Performance BMW — September 2017

82 PERFORMANCE BMW

TECH GUIDE

NEXT MONTH

We look at spacers, adapters, spigot rings and

mounting hardware

TUCK, FLUSH AND POKE

We will quickly explain these, purely because not everyone reading this

will be a wheel expert and we’ve all go to start somewhere. They are

pretty self-explanatory; if you tuck, it means your wheels sit in from your

wheel arch lips; fl ush means your wheel faces are exactly in-line with your

arches while poke means your wheels extend past your wheel arches.

Be careful when it comes to poke as you can get in trouble with the law;

there are lots of rules but as long as your wheels do not extend further

than 30mm beyond your arch lips, you should be fi ne.

TWIN VALVE STEMS

You might occasionally see a wheel with twin valves and be

wondering what that’s all about, and there are two explanations you

will encounter. The fi rst is that they allow air to be purged from the

tyre while it is simultanously fi lled with nitrogen. The second is that

they allow the wheel to be infl ated while pressure is checked via the

second valve for quicker and more accurate infl ation.

CONCAVE WHEELS

Concave wheels follow the same rules as deep

dish wheels do when it comes to visual drama:

the wider the wheel and the lower the offset,

the more concave the spokes will be. While

concave wheels won’t suit every car, on the right

car they can look spectacular and, while you’re

pretty limited if you want deep dish wheels

on a budget, when to comes to concave there

are a lot of affordable wheels on the market.

BM Autosport, for example, which has been

dealing with wheels for BMWs for over 15 years,

carries a huge range of wheels for just about

every BMW model with plenty of sexy concave

designs to choose from. Of course, if you want

to push the boat out, you can opt for a multi-

piece concave wheel and that’s when the prices

start going up at a rate of knots, but you can

get some fantastic looking wheels with a variety

of different styles and designs such as deep

concave with a step lip. You pays your money,

you takes your choice.

PBMW217.tech_guide.ed3.indd 82 07/08/2017 08:45